Valence Bond Theory (VBT) 价键理论 F2 F=1s22s22p5F=1s22s22p5 (a) 2p2 2p2 The maximum overlap of the 2p orbitals of the two F atoms (2p)
F = 1s22s22p5 Valence Bond Theory (VBT) F2: F = 1s22s22p5 价键理论 The maximum overlap of the 2p orbitals of the two F atoms
VBT in CCla diatomic molecules Case 1:Valence orbital diagram: Polyatomic molecules [HelN个↑ [Hey!L① 12C: 3s 3px 3py 3pz 3s 3px 3py 3pz 6C. HeL①个 2s 2Px 2Py 2pz HeNN个个 HeNN个N个 3s 3px 3py 3pz 3s 3px 3py 3pz C atom should form two perpendicular bonds
VBT in CCl4 Valence orbital diagram: [He] ↑↓ ↑↓ ↑↓ ↑ 3s 3px 3py 3pz Case 1: 17Cl: ↑↓ ↑ ↑ [He] ↑↓ ↑↓ ↑↓ ↑ 3s 3px 3py 3pz ○ ○ □ diatomic molecules Polyatomic molecules C atom should form two perpendicular bonds CCl ×4 6C: [He] ↑↓ ↑ ↑ __ 2s 2px 2py 2pz ○ [He] ↑↓ ↑↓ ↑↓ ↑ 3s 3px 3py 3pz □ □ [He] ↑↓ ↑↓ ↑↓ ↑ 3s 3px 3py 3pz
9.5 Orbital Hybridization 轨道杂化 CCL Lewis VSEPR Molecular Structure Theory: geometry Linus Carl Pauling 109.5 VBT introduced the idea of orbital hybridization
9.5 Orbital Hybridization VSEPR Theory: 109.5° Lewis Structure 轨道杂化 Linus Carl Pauling Molecular geometry CCl4 VBT introduced the idea of orbital hybridization
spi Hybrid Orbitals CCL 杂化轨道 C:1s22s22p 2p 2p 2s 2s 11 11 Ground State Promoted State 4 sp'hybrid orbitals 基态 激发态 2P Hybridization 杂化 2P 2P, 4 sp hybrid orbitals 杂化轨道
sp3 Hybrid Orbitals 2 6 2 2 C : 1s 2s p 2 CCl4 杂化轨道 基态 激发态 杂化 杂化轨道
sp Hybrid Orbitals %3 % 3 23 Shown together (large lobes only) The same shape and different 3 109.5 orientations Band angle 键角 3 Band angle 3 键角 90° 3 109.5 + S + Pe卫y and p, 4 sp3
The same shape and different orientations sp3 Hybrid Orbitals Band angle + s + px, py and pz 4 sp3 90° 109.5° orientations Band angle 键角 Band angle 键角